The vertical section of Xuwei port’s breakwater in Lianyungang adopts the innovative new bucket-based structure,i.e. single barrel with cellular structures. Based on the application of the floating stability,bottomless model,transfer within the precast yard and the gas floating process under negative pressure,and research and development of the automatic control system,we form a complete set of construction technology. This paper introduces the application of this technology to provide a technical support to the popularization and application of this structure.